US3745395A - Spacer for the windings of an electrical machine - Google Patents

Spacer for the windings of an electrical machine Download PDF

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Publication number
US3745395A
US3745395A US00188873A US3745395DA US3745395A US 3745395 A US3745395 A US 3745395A US 00188873 A US00188873 A US 00188873A US 3745395D A US3745395D A US 3745395DA US 3745395 A US3745395 A US 3745395A
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US
United States
Prior art keywords
spacer
windings
guides
magnetic core
binding plate
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US00188873A
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English (en)
Inventor
P Koechlin
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Alstom SA
Original Assignee
Unelec SA
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Filing date
Publication date
Application filed by Unelec SA filed Critical Unelec SA
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Publication of US3745395A publication Critical patent/US3745395A/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/46—Fastening of windings on the stator or rotor structure
    • H02K3/50—Fastening of winding heads, equalising connectors, or connections thereto
    • H02K3/505—Fastening of winding heads, equalising connectors, or connections thereto for large machine windings, e.g. bar windings

Definitions

  • the present invention relates to a spacer for the windings of an electrical machine.
  • the combs however have several disadvantages. They are expensive to produce because of the materials and accurate machining which are required. Furthermore as the combs cannot usually be fixed directly against the end of the magnetic core, it is necessary to project the windings still further from the core and thus increase the size of the machine.
  • a spacer for the windings of an electrical machine where these project from the magnetic core thereof comprising an arcuate support for attachment to the core and defining axially extending guides on which are mounted a set of circumferentially spaced and radially extending individual blades for separating the windings.
  • FIG. I shows a partial cross-section of the stator of an electrical machine having a known spacer
  • FIG. 2 is a section along the line IIII of FIG. 1;
  • FIGS. 3, 5 and 7 respectively are a partial end view of the stator of an electrical machine fitted with three new types of spacer;
  • FIGS. 4, 6 and 8 are partial axial sections of the stators as shown in FIGS. 3, 5 and 7 respectively.
  • the stator has a laminated magnetic core 1 from which project straight portions 2 of the windings.
  • the magnetic core 1 is bound by a binding plate 3 which may be in the form of a ring.
  • a comb 5 is screwed to the binding plate 3 by screws 4.
  • the comb 5 which is of electrically insulating material has teeth 6 between which are inserted the straight portions of the winding.
  • the comb 5 is displaced from the core 1 by a distance equal to the thickness of the binding plate 3.
  • the comb 5 must be accurately machined as must the laminations of the magnetic core.
  • a set of electrically insulating blades 8 are placed between the straight portions 2 of the windings where they project from the magnetic core 1, and are embedded in the binding plate 3.
  • the blades are placed immediately adjacent the magnetic core 1 but they may be displaced from it by a certain distance, for example 10 millimeters, in order to allow for ventilation. It can be seen that in this way it is possible to place the blades at the best distance from the magnetic core and it is no longer necessary to take into account the thickness of the binding ring 3.
  • the blades may be wedge shaped so as to fit between successive straight portions of the windings.
  • the blades may be of a layered material for example a material with a base of paper, wood or fiber glass and held together by a natural or synthetic resin, for example phenolic, cresolic, melamine, polyester, epoxy or silicone resin capable of withstanding the operating temperature.
  • a natural or synthetic resin for example phenolic, cresolic, melamine, polyester, epoxy or silicone resin capable of withstanding the operating temperature.
  • the dimensions of the blades are a function of the dimensions of the windings and of the position of the binding plates 3. However, it is desirable that their width, in the axial direction of the machine, is equal to at least two thirds of the radial width of the straight portions of the windings.
  • the blades are preferably mounted with an adhesive, in liquid or paste form, so as to hold them firmly in position.
  • the blades may also be mounted having previously surrounded them with a layer of compressible material which may be preimpregnated with a resin or thermo-hardening adhesive. This layer can be of a fabric, a felt or synthetic or glass fibers.
  • the advantage of the layer is that it allows insulating blades, for example which are layered, to be used which are not accurately machined for the purpose. For example standard blades may be brought and covered with the compressible layer without necessitating accurate machining.
  • Each blade can be a single piece or, as is shown in FIG. 3, formed of two smaller pieces 11.
  • the blades 8 which may be single blades, combinations of a web 9 surrounded by the layer 10 or the two smaller pieces 1 1 also surrounded by the layer 10 are embedded in grooves 12 placed in the binding plate 3.
  • the advantage of having two separate pieces forming a blade is that it facilitates the mounting of the blade when the windings are wound.
  • the upper straight portion is generally mounted first and followed by the lower straight portion.
  • the winding does not undergo an impregnation treatment but only, for example, undergoes a polymerization treatment, it is advantageous to use a preimpregnated layer which will polymerize at a temperature equal to or greater than that of the surroundings.
  • a polyester resin or epoxy adhesive may be used. If the winding undergoes an impregnation treatment, it is more uneconomical to use a nonimpregnated layer since the impregnation resin itself is sufficient.
  • the spacer is as firm as a comb of insulating material.
  • the number of grooves 12, their length and depth are chosen so that the blades are held sufiiciently firmly, taking into account their sharing resistance. However, generally at least six to 12 grooves are used which are symmetrically distributed aroundthe binding plate.
  • the grooves 12 are placed along the axes of the teeth of the magnetic core 1. For this reason, the blade 8 shown on the left of FIG. 3 is longer than the blade shown immediately to its right in this figure. These two blades are wedge shaped to take into account the tapering of the gaps between the windings. It can be seen how when the layer 10 is used, as with the two blades at the right of the figure, it is no longer necessary to machine the blades to fit in the gaps between the windings.
  • FIG. 4 shows the blade 8 mounted without an insulating layer in the groove 12 in the binding plate 3. It can be seen how the distance 13 between the blade 8 and the magnetic core 1 can be freely chosen. After mounting the winding and all the blades, the windings are held as firmly to the magnetic circuit as is the case with an insulating comb.
  • metallic U-shaped parts 14 are welded or screwed to the binding plate.
  • two metallic blocks are screwed or welded to the binding plate their separation distance being equal to the thickness of a blade at its base. The blades can then be slotted into these guides as shown.
  • FIG. 6 shows a section along the line VI-VI of FIG. and it can be seen how the blades are then spaced from the magnetic core 1.
  • FIG. 7 and FIG. 8 which is a section along the line VIII-VIII of FIG. 7, an insulating blade 8, on the left of the FIG. 7, is threaded on a pin 16.
  • an insulating blade 8 is threaded on two pins 16. This is an alternative method of fastening the blades to a support which may be the binding plate.
  • the ends of the straight portions of the windings must be able to expand relative to the magnetic core as their expansion coefficient is greater than that of the magnetic core.
  • the straight portions adjacent the fastened blades can expand freely.
  • anti-adhesive means such as a layer of anti-adherent.
  • a thin film of an antiadherent for example cellulose triacetate, polyvinyl fluoride, tetrafluoroethylene or an analogous chemical compound may be used. This allows the axial sliding of blades relative to the magnetic core.
  • These antiadhesive means do not hinder the properties of the blades as regards spacing and holding in position the straight portions of the windings relative to the magnetic core.
  • the spacer may be used, for example, for the stators, rotor or induction windings of electric motors or electric generators.
  • a spacer, as described, is less expensive than the proposed combs. Also it does not require complicated and precide manufacturing.
  • a spacer for the windings of an electrical machine, which windings project from the magnetic core thereof, comprising an arcuate support attached to the core and defining axially extending guides and a set of circumferentially spaced and radially extending separate blade elements individually mounted in said axially extending guides for separating the windings.
  • each blade element is formed of two separate halves.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Insulation, Fastening Of Motor, Generator Windings (AREA)
US00188873A 1970-10-13 1971-10-13 Spacer for the windings of an electrical machine Expired - Lifetime US3745395A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7037000A FR2109350A5 (de) 1970-10-13 1970-10-13

Publications (1)

Publication Number Publication Date
US3745395A true US3745395A (en) 1973-07-10

Family

ID=9062681

Family Applications (1)

Application Number Title Priority Date Filing Date
US00188873A Expired - Lifetime US3745395A (en) 1970-10-13 1971-10-13 Spacer for the windings of an electrical machine

Country Status (5)

Country Link
US (1) US3745395A (de)
BR (1) BR7106798D0 (de)
DE (1) DE2150163C3 (de)
FR (1) FR2109350A5 (de)
GB (1) GB1341905A (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3975655A (en) * 1972-06-26 1976-08-17 Kraftwerk Union Aktiengesellschaft Coil end support for the stator winding of electric machines such as turbo generators or the like
US4152615A (en) * 1977-06-14 1979-05-01 Westinghouse Electric Corp. End iron axial flux damper system
US20050127779A1 (en) * 2003-12-13 2005-06-16 Siemens Westinghouse Power Corporation Adjustable fit wedges
US20090289519A1 (en) * 2008-05-20 2009-11-26 Hitachi, Ltd. Electric rotating machine
US20150001982A1 (en) * 2012-03-23 2015-01-01 Alstom Technology Ltd Method for repairing a rotor and rotor

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4808873A (en) * 1987-08-31 1989-02-28 Westinghouse Electric Corp. Support arrangement including spacer elements for diamond area of dynamoelectric machine
US4853577A (en) * 1988-02-25 1989-08-01 Westinghouse Electric Corp. Semi-rigid spacer for diamond area of dynamoelectric machine
ATE103121T1 (de) * 1989-09-20 1994-04-15 Asea Brown Boveri Vorrichtung zur fixierung der windungsenden einer statorwicklung in einer dynamoelektrischen maschine.

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3975655A (en) * 1972-06-26 1976-08-17 Kraftwerk Union Aktiengesellschaft Coil end support for the stator winding of electric machines such as turbo generators or the like
US4152615A (en) * 1977-06-14 1979-05-01 Westinghouse Electric Corp. End iron axial flux damper system
US20050127779A1 (en) * 2003-12-13 2005-06-16 Siemens Westinghouse Power Corporation Adjustable fit wedges
US7081695B2 (en) * 2003-12-13 2006-07-25 Siemens Power Generation, Inc. Adjustable fit wedges
US20090289519A1 (en) * 2008-05-20 2009-11-26 Hitachi, Ltd. Electric rotating machine
US8004145B2 (en) * 2008-05-20 2011-08-23 Hitachi, Ltd. Electric rotating machine
US20150001982A1 (en) * 2012-03-23 2015-01-01 Alstom Technology Ltd Method for repairing a rotor and rotor
US10193407B2 (en) * 2012-03-23 2019-01-29 General Electric Technology Gmbh Method for repairing a rotor

Also Published As

Publication number Publication date
FR2109350A5 (de) 1972-05-26
DE2150163B2 (de) 1979-09-06
BR7106798D0 (pt) 1973-04-17
DE2150163C3 (de) 1980-05-22
DE2150163A1 (de) 1972-04-20
GB1341905A (en) 1973-12-25

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